CN114320446B - Extraction method for reserved pipe - Google Patents
Extraction method for reserved pipe Download PDFInfo
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- CN114320446B CN114320446B CN202111647711.4A CN202111647711A CN114320446B CN 114320446 B CN114320446 B CN 114320446B CN 202111647711 A CN202111647711 A CN 202111647711A CN 114320446 B CN114320446 B CN 114320446B
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- tee joint
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- goaf
- gas pipe
- gas
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- 238000000605 extraction Methods 0.000 title claims abstract description 26
- 238000005065 mining Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 33
- 229910000831 Steel Inorganic materials 0.000 claims description 16
- 239000010959 steel Substances 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 6
- 238000002485 combustion reaction Methods 0.000 abstract description 5
- 230000002269 spontaneous effect Effects 0.000 abstract description 5
- 230000003647 oxidation Effects 0.000 abstract description 2
- 238000007254 oxidation reaction Methods 0.000 abstract description 2
- 230000000630 rising effect Effects 0.000 abstract description 2
- 230000017525 heat dissipation Effects 0.000 description 4
- 239000003245 coal Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 206010003497 Asphyxia Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- Pipe Accessories (AREA)
- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
Abstract
The invention discloses a tube-remaining extraction method, which comprises the following steps: s1: preparing before mining, namely preparing before installing a gas pipe according to a gas mining surface; s2: installing a gas pipe, wherein a novel tee joint is arranged every 20-40 meters when the gas pipe is installed, and a T-shaped inverted tee joint is arranged on the novel tee joint; when the last novel tee joint enters the goaf for 3-5 meters, an operating mechanism on the next novel tee joint is operated in time to plug a port connected with the inner end of the goaf on the last novel tee joint; s3: and (5) gas exploitation, namely, gas exploitation is carried out by using gas exploitation equipment. According to the invention, the short connection of the gas pipe is realized by arranging the tray flange on the gas pipe, the T-shaped inverted tee of the last tee can be opened and the main pipe is disconnected from the deep part of the goaf by operating the wire spool of the next novel tee, the gas extraction of the upper corner of the goaf and the goaf is realized while the operation is convenient, and spontaneous combustion of the goaf caused by the fact that the pipe-retaining tee is positioned in the oxidation temperature rising zone and the choking zone of the goaf is avoided.
Description
Technical Field
The invention relates to a stay tube extraction method, and belongs to the technical field of coal mine gas exploitation.
Background
The gas control work of the coal mine is a serious issue of safe production. At present, the main methods of gas control on coal mine working surfaces are extraction and air drainage. The extraction is mainly drilling pre-extraction and goaf pressure relief gas extraction. From gas source analysis, particularly on first-production working surfaces, the gas emission amount of a production layer is generally below 20%, and more than 80% of the gas emission amount is from upper and lower adjacent layers. In the stoping process of the stope, a large amount of gas in the upper and lower adjacent layers enters the goaf from the top and bottom plate cracks of the goaf due to the change of surrounding rock acting force, and once the gas control capability of the goaf is insufficient, the upper corner of the stope and the gas overrun of return air flow can be caused to easily cause spontaneous combustion of the goaf.
The gas pipe is reserved, at present, the goaf pressure relief gas drainage process mainly comprises three steps of preparation before exploitation, installation of the gas pipe and gas exploitation, wherein a common inverted T-shaped positive tee joint or an upper and lower turning plate tee joint is mainly adopted to drain upper corner gas in the installation process of the gas pipe, and the positive tee joint or the upper and lower turning plate tee joint are both positioned in a goaf heat dissipation belt in the existing goaf pressure relief gas drainage process, so that on one hand, the tee joint is inconvenient to operate, and on the other hand, the reserved pipe cannot be disconnected to be always positioned in the goaf heat dissipation belt and the suffocation belt to easily cause spontaneous combustion of the goaf.
Disclosure of Invention
The invention aims to solve the technical problems that: the method for extracting the left pipe solves the problems that in the original left pipe extraction process, when the tee joint is opened to extract upper corner gas, the left pipe cannot be disconnected, so that the left pipe is always positioned in a goaf radiating belt, and spontaneous combustion of the goaf is easy to occur.
The technical scheme adopted by the invention is as follows: a tube-retaining extraction method comprises the following steps:
s1: preparing before mining, namely preparing before installing a gas pipe according to a gas mining surface;
s2: installing a gas pipe, wherein a novel tee joint is arranged every 20-40 meters when the gas pipe is installed, and a T-shaped inverted tee joint is arranged on the novel tee joint; at least two ends of each novel tee joint are respectively provided with a short-circuit mechanism capable of shorting the gas pipe; when the last novel tee joint enters the goaf for 3-5 meters, an operating mechanism on the next novel tee joint is operated in time to plug a port connected with the inner end of the goaf on the last novel tee joint, so that the last novel tee joint and the corresponding T-shaped inverted tee joint are always positioned in a goaf heat dissipation belt;
s3: and (5) gas exploitation, namely, gas exploitation is carried out by using gas exploitation equipment.
Preferably, the shorting mechanism in the step S2 is a loose flange.
Preferably, the operating mechanism comprises a pulley block arranged in the novel tee joint, a wire spool is arranged in the next novel tee joint which is positioned at one side of the novel tee joint far away from the inner end of the goaf, the wire spool is connected with the pulley block and is tightly tightened with the same annular steel wire rope, one end of the steel wire rope is fixed with the wire spool, and the other end of the steel wire rope slides along the pulley block; the novel tee joint is internally hinged with a turning plate, and one end of the turning plate is fixed on a steel wire rope; the wire spool is provided with a self-locking mechanism.
Preferably, a handle is fixed on the rotating shaft of the wire spool.
Preferably, the whole steel wire rope is Z-shaped.
Preferably, the novel tee joint is provided with a transparent observation window.
Preferably, the observation window is in clamping connection with the novel tee joint.
Preferably, one end of the wire spool is coaxially provided with a cam, and the cam is rotationally connected inside the gas pipe; the wire spool and the cam are coaxially provided with a first threaded through hole and a second threaded through hole, the first threaded through hole and the second threaded through hole are internally connected with the same threaded rod in a threaded manner, and when the threaded rod moves along the axial direction, the wire spool and the cam simultaneously rotate positively or reversely; one end, far away from the cam, of the threaded rod penetrates through the gas pipe and is in sliding sealing connection with the gas pipe; the gas pipe is characterized in that a cylinder body is fixed in the gas pipe, a sliding plate is connected in a sliding sealing mode in the cylinder body, the sliding plate is connected with the bottom of the cylinder body through a spring, a fixing rod is fixed on one end, far away from the spring, of the sliding plate, and the fixing rod is attached to the contour of the cam; the bottom of the cylinder body is provided with a one-way water inlet valve and a one-way water outlet valve, the one-way water inlet valve is communicated with the bottom of the novel tee joint, and the one-way water outlet valve is communicated with the outside.
Preferably, a pull ring is fixed on one end of the threaded rod, which is positioned outside the gas pipe.
The invention has the beneficial effects that:
1. compared with the prior art, the invention realizes the short connection of the gas pipe by arranging the movable disc flange on the gas pipe in the process of installing the gas pipe, and can open the T-shaped inverted tee of the last tee and disconnect the main pipe from the deep part of the goaf by operating the wire spool of the next novel tee, thereby realizing the gas extraction of the upper corner of the mining surface and the goaf while being convenient to operate, and avoiding spontaneous combustion of the goaf caused by the fact that the pipe-retaining tee is positioned in the oxidation temperature rising zone and the suffocating zone of the goaf.
2. Compared with the prior art, the novel pipe-retaining tee joint has the advantages that the design of the turning plate is scientific and reasonable, the sealing performance is strong, the long-distance operation is realized, the fire hazard caused by the fact that the original common tee joint or the upper and lower turning plate tee joints leak gas and isolate the deep part of a goaf is avoided, meanwhile, the novel pipe-retaining tee joint has an open operation space during the operation of personnel, and the novel pipe-retaining tee joint is safer and more efficient than the common tee joint and the upper and lower turning plate tee joint.
3. Compared with the prior art, the novel tee joint is provided with the observation window, and when the pipe is left with the conditions of ponding, blockage and the like, the novel tee joint observation window can be opened one by one to remove hidden dangers, so that the tee joint is convenient and quick.
4. Especially, compared with the prior art, the invention can realize the rotation of the wire spool and the cam by pushing and pulling the threaded rod, is convenient to operate, ensures that the threaded rod is separated from the cam when water is not required to be discharged, and ensures that the threaded rod is matched with the cam when water is required to be discharged, the threaded rod simultaneously drives the wire spool and the cam to rotate, the cam is matched with the spring to drive the sliding plate to slide reciprocally, the cylinder body is equivalent to a water pump, and the cylinder body intermittently absorbs water and discharges water, thereby realizing the automatic discharge of water in the novel tee joint and replacing manual water discharge.
Drawings
FIG. 1 is a schematic diagram of the cooperation structure of the gas pipe and the novel tee joint of the invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings and specific examples.
Example 1:
a tube-retaining extraction method comprises the following steps:
s1: preparing before mining, namely preparing before installing a gas pipe (10) according to a gas mining surface, wherein the step adopts the prior art;
s2: a gas pipe (10) is arranged, a novel tee joint (20) is arranged every 30 meters when the gas pipe (10) is arranged, and a T-shaped inverted tee joint (30) is arranged on the novel tee joint (20); two ends of each novel tee joint (20) are respectively provided with a movable disc flange (11) which can short-circuit the gas pipe (10); when the last novel tee joint (20) is positioned at the left side of the drawing and enters the goaf for 3 meters, an operating mechanism of the next novel tee joint (20) positioned at the right side of the drawing is operated in time to plug a port connected with the inner end of the goaf on the last novel tee joint (20), so that the last novel tee joint (20) and the corresponding T-shaped inverted tee joint (30) are always positioned in a goaf heat dissipation belt;
as shown in fig. 1, the appearance of the novel tee joint (20) is in an inverted T shape, the left outlet and the right outlet of the novel tee joint (20) are respectively connected with the left end and the right end of the gas pipe (10), and the outlet at the upper end of the novel tee joint (20) is connected with the outlet at the lower end of the inverted tee joint (30); the novel tee joint (20) is internally hinged with a circular turning plate (22) through a rotating shaft (21), the novel tee joint (20) is internally provided with a pulley block, the pulley block comprises three pulleys (24), the three pulleys (24) are respectively arranged below a left outlet of the novel tee joint (20), above the right outlet and below a right outlet of the novel tee joint, the inside of the left outlet of another novel tee joint (20) connected with the right end of a gas pipe (10) is rotationally connected with a wire spool (12), the wire spool (12) is connected with the same annular steel wire rope (26) on the pulley block, the right end of the steel wire rope (26) is fixed with the wire spool (12), one end of the steel wire rope (26) is loosened, the other end of the steel wire rope (26) is tightened when the wire spool (12) rotates, the left end of the steel wire rope (26) slides along the pulley block, the whole steel wire rope (26) is Z-shaped, and the pulley block plays a role in guiding and tensioning; the lower end of the turning plate (22) is fixed on a steel wire rope (26) through a fixed block (23); the wire spool (12) is provided with a self-locking mechanism, the structure of the self-locking mechanism is existing, and the principle is similar to that of a hand-operated lifting clothes-horse. In order to facilitate winding, a handle (13) is fixed on a rotating shaft (21) of the wire spool (12). The handle (13) on the wire spool (12) in the other novel tee joint (20) is held and rotated, so that the wire rope (26) can slide clockwise and anticlockwise around the pulley block, when the wire rope (26) slides anticlockwise to a limit position, the fixed block (23) is limited by the pulley (24) below the left outlet of the novel tee joint (20), and the fixed block (23) drives the turning plate (22) to be positioned in the vertical direction, so that the turning plate (22) can block the left outlet of the novel tee joint (20); when the steel wire rope (26) slides clockwise to the limit position, the fixed block (23) is limited by the pulley (24) at the upper right of the upper outlet of the novel tee joint (20), and the fixed block (23) drives the turning plate (22) to be positioned in the horizontal direction, so that the turning plate (22) can seal the upper outlet of the novel tee joint (20); after the gas pipe (10) is short-circuited through the movable disc flange (11), the T-shaped inverted tee (30) of the last tee can be opened and the gas pipe (10) is disconnected from the deep part of the goaf only by operating the wire spool (12) in the next novel tee (20), so that pressure relief gas drainage of the goaf is facilitated;
s3: the gas exploitation is carried out by using gas exploitation equipment, and the step adopts the prior art.
In this embodiment, as shown in fig. 1, the novel tee joint (20) is clamped with a transparent observation window (25), and when the pipe is left with water accumulation, blockage and other conditions, the observation windows (25) of the novel tee joint (20) can be opened one by one to eliminate hidden danger, so that the novel tee joint is convenient and quick.
Example 2
Because the operation space inside the gas pipe (10) is narrow, the handle (13) of the manual rotary wire spool (12) is inconvenient to operate, and in addition, when water enters the gas pipe (10), the observation window (25) is required to be manually opened for draining, so that the operation is inconvenient.
Example 2 differs from example 1 in that: as shown in fig. 2, the axis of the wire spool (12) is arranged along the horizontal direction, the wire spool (12) is rotationally connected inside the gas pipe (10) through a limiting plate (42) with an F-shaped cross section, a cam (43) is coaxially arranged at the left end of the wire spool (12), and the cam (43) is rotationally connected inside the gas pipe (10); the inside of wire reel (12) and cam (43) and wire reel (12) coaxial have offered first screw thread through-hole and second line through-hole, first screw thread through-hole and second line through-hole inside threaded connection have same threaded rod (40), when threaded rod (40) are along axis direction left motion, wire reel (12) and cam (43) forward rotation simultaneously, when threaded rod (40) are along axis direction right motion, wire reel (12) and cam (43) reverse rotation simultaneously, the principle of threaded rod (40) and wire reel (12) and cam (43) cooperation is similar to rotatory mop, the right-hand member of threaded rod (40) is cylindric, the right-hand member surface of threaded rod (40) is smooth, the right-hand member of threaded rod (40) runs through gas pipe (10) and with gas pipe (10) sliding seal connection, be fixed with rectangular frame dress pull ring (41) on the right-hand member of threaded rod (40), the setting of pull ring (41) conveniently pulls threaded rod (40); a cylinder body (50) with an axis arranged along the vertical direction is fixed in the gas pipe (10), a sliding plate (51) is connected in the cylinder body (50) in a sliding and sealing manner, the sliding plate (51) slides along the vertical direction, the lower end of the sliding plate (51) is connected with the bottom of the cylinder body (50) through a spring (53), a fixed rod (52) with an axis arranged along the vertical direction is fixed at the upper end of the sliding plate (51), and the fixed rod (52) is attached to the contour of the cam (43); the bottom of the cylinder body (50) is provided with a one-way water inlet valve (56) and a one-way water outlet valve (54), the one-way water inlet valve (56) is communicated with the bottom of the novel tee joint (20) through a water suction pipe (57), and the one-way water outlet valve (54) is communicated with the outside through a water outlet pipe (55).
The wire spool (12) and the cam (43) can be rotated by pushing and pulling the threaded rod (40) through the pull ring (41), the operation is convenient, when water is not required to be discharged, the threaded rod (40) is separated from the cam (43), the threaded rod (40) only drives the wire spool (12) to rotate, when water is required to be discharged, the threaded rod (40) is matched with the cam (43), the threaded rod (40) simultaneously drives the wire spool (12) and the cam (43) to rotate, when one end, closest to the threaded rod (40), of the cam (43) approaches the cylinder (50), the cam (43) drives the fixed rod (52) and the sliding plate (51) to move downwards and compress the spring (53), positive pressure is generated inside the cylinder (50), the one-way water inlet valve (56) is closed, the one-way water outlet valve (54) is opened, and the cylinder (50) is drained; when one end of the cam (43) farthest from the threaded rod (40) approaches the cylinder body (50), the spring (53) drives the fixed rod (52) and the sliding plate (51) to move upwards and always fit with the contour of the cam (43), negative pressure is generated inside the cylinder body (50), the one-way water inlet valve (56) is opened, the one-way water outlet valve (54) is closed, and water is absorbed inside the cylinder body (50); the cam (43) and the spring (53) cooperate to drive the sliding plate (51) to slide in a reciprocating manner, so that intermittent water absorption and drainage of the cylinder body (50) are realized, the cylinder body (50) is equivalent to a water pump, and the automatic drainage of water in the novel tee joint (20) is realized to replace manual drainage.
The foregoing is merely illustrative of the present invention, and the scope of the present invention is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the scope of the present invention, and therefore, the scope of the present invention shall be defined by the scope of the appended claims.
Claims (7)
1. A tube-retaining extraction method is characterized in that: the method comprises the following steps:
s1: preparing before mining, namely preparing before installing a gas pipe (10) according to a gas mining surface;
s2: a gas pipe (10) is arranged, a novel tee joint (20) is arranged every 20-40 meters when the gas pipe (10) is arranged, and a T-shaped inverted tee joint (30) is arranged on the novel tee joint (20); at least two ends of each novel tee joint (20) are respectively provided with a short-circuit mechanism which can short-circuit the gas pipe (10); when the last novel tee joint (20) enters the goaf for 3-5 meters, an operating mechanism on the next novel tee joint (20) is operated in time to plug a port connected with the inner end of the goaf on the last novel tee joint (20), so that the last novel tee joint (20) and the corresponding T-shaped inverted tee joint (30) are always positioned in a goaf radiating belt;
s3: gas exploitation, namely, gas exploitation is carried out by using gas exploitation equipment;
the operating mechanism comprises a pulley block arranged in the novel tee joint (20), a wire spool (12) is arranged in the next novel tee joint (20) which is positioned on one side of the novel tee joint (20) far away from the inner end of the goaf, the wire spool (12) is connected with a wire rope (26) which is in the same annular shape and is tightened on the pulley block, one end of the wire rope (26) is fixed with the wire spool (12), and the other end of the wire rope (26) slides along the pulley block; a turning plate (22) is hinged inside the novel tee joint (20), and one end of the turning plate (22) is fixed on a steel wire rope (26); the wire spool (12) is provided with a self-locking mechanism; one end of the wire spool (12) is coaxially provided with a cam (43), and the cam (43) is rotationally connected inside the gas pipe (10); the wire spool (12) and the cam (43) are coaxially provided with a first threaded through hole and a second threaded through hole, the first threaded through hole and the second threaded through hole are internally connected with the same threaded rod (40) in a threaded manner, and when the threaded rod (40) moves along the axial direction, the wire spool (12) and the cam (43) rotate positively or reversely at the same time; one end, far away from the cam (43), of the threaded rod (40) penetrates through the gas pipe (10) and is in sliding sealing connection with the gas pipe (10); a cylinder body (50) is fixed in the gas pipe (10), a sliding plate (51) is connected in the cylinder body (50) in a sliding and sealing mode, the sliding plate (51) is connected with the bottom of the cylinder body (50) through a spring (53), a fixing rod (52) is fixed at one end, far away from the spring (53), of the sliding plate (51), and the fixing rod (52) is attached to the contour of the cam (43); the bottom of the cylinder body (50) is provided with a one-way water inlet valve (56) and a one-way water outlet valve (54), the one-way water inlet valve (56) is communicated with the bottom of the novel tee joint (20), and the one-way water outlet valve (54) is communicated with the outside; and a pull ring (41) is fixed on one end of the threaded rod (40) positioned outside the gas pipe (10).
2. The tube-retaining extraction method according to claim 1, wherein the tube-retaining extraction method comprises the following steps: the short-circuiting mechanism in the step S2 is a movable disc flange (11).
3. The tube-retaining extraction method according to claim 1, wherein the tube-retaining extraction method comprises the following steps: the operating mechanism comprises a pulley block arranged in the novel tee joint (20), a wire spool (12) is arranged in the next novel tee joint (20) which is positioned on one side of the novel tee joint (20) far away from the inner end of the goaf, the wire spool (12) is connected with a wire rope (26) which is in the same annular shape and is tightened on the pulley block, one end of the wire rope (26) is fixed with the wire spool (12), and the other end of the wire rope (26) slides along the pulley block; a turning plate (22) is hinged inside the novel tee joint (20), and one end of the turning plate (22) is fixed on a steel wire rope (26); the wire spool (12) is provided with a self-locking mechanism.
4. The tube-retaining extraction method according to claim 1, wherein the tube-retaining extraction method comprises the following steps: a handle (13) is fixed on a rotating shaft (21) of the wire spool (12).
5. The tube-retaining extraction method according to claim 1, wherein the tube-retaining extraction method comprises the following steps: the steel wire rope (26) is Z-shaped as a whole.
6. The tube-retaining extraction method according to claim 1, wherein the tube-retaining extraction method comprises the following steps: the novel tee joint (20) is provided with a transparent observation window (25).
7. The tube-retaining extraction method according to claim 6, wherein the tube-retaining extraction method comprises the following steps: the observation window (25) is clamped with the novel tee joint (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111647711.4A CN114320446B (en) | 2021-12-29 | 2021-12-29 | Extraction method for reserved pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111647711.4A CN114320446B (en) | 2021-12-29 | 2021-12-29 | Extraction method for reserved pipe |
Publications (2)
| Publication Number | Publication Date |
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| CN114320446A CN114320446A (en) | 2022-04-12 |
| CN114320446B true CN114320446B (en) | 2023-11-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111647711.4A Active CN114320446B (en) | 2021-12-29 | 2021-12-29 | Extraction method for reserved pipe |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205089360U (en) * | 2015-11-13 | 2016-03-16 | 山西潞安集团余吾煤业有限责任公司 | Large aperture collecting space area pipe laying gas drainage device |
| CN108892269A (en) * | 2018-07-09 | 2018-11-27 | 谭沛卿 | A kind of sewage-treatment plant of preliminary treatment |
| CN109915205A (en) * | 2019-04-23 | 2019-06-21 | 吕梁学院 | Dead-weight deslagging water discharging device and its deslagging discharge water method |
| CN110056391A (en) * | 2019-03-25 | 2019-07-26 | 中南大学 | A kind of Deep Shaft Mine in China auxiliary dewatering device using earth's surface water potential energy |
| CN214403661U (en) * | 2021-01-22 | 2021-10-15 | 贵州盘江精煤股份有限公司 | Device for intercepting gas at upper corner of mining face |
-
2021
- 2021-12-29 CN CN202111647711.4A patent/CN114320446B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205089360U (en) * | 2015-11-13 | 2016-03-16 | 山西潞安集团余吾煤业有限责任公司 | Large aperture collecting space area pipe laying gas drainage device |
| CN108892269A (en) * | 2018-07-09 | 2018-11-27 | 谭沛卿 | A kind of sewage-treatment plant of preliminary treatment |
| CN110056391A (en) * | 2019-03-25 | 2019-07-26 | 中南大学 | A kind of Deep Shaft Mine in China auxiliary dewatering device using earth's surface water potential energy |
| CN109915205A (en) * | 2019-04-23 | 2019-06-21 | 吕梁学院 | Dead-weight deslagging water discharging device and its deslagging discharge water method |
| CN214403661U (en) * | 2021-01-22 | 2021-10-15 | 贵州盘江精煤股份有限公司 | Device for intercepting gas at upper corner of mining face |
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| CN114320446A (en) | 2022-04-12 |
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